Entwicklungstendenzen von Seitenkanalverdichtern

In the field of the low vacuum engineering with pressures down to p_s = 10 kPa regenerative blowers are increasingly used due to their delivery of a steady pulsation-free gas volume flow, their simply design and their small dimensions because of high pressure coefficients compared with other generators of vacuum. At present they reach absolute suction pressures of p_s = 40 kPa (400 mbar) with the single-stage type and p_s = 10 kPa with the multi-stage type with the limiting pressures still not reached. The pressure ratio of single-stage compressors and especially that of multistage compressors can be considerable raised by increasing of now archieved peripheral speed so that in the vacuum field pressure ratios up to π = 50 with absolute suction pressures of p_s = 2 kPa are within reach. These trends in design are shown and justified.